Radiation shutters

Details Radiation shutters Radiation shutters

1978-02-09

1980-10-07

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358213, 250334, 250338, H04N 533, H04N 314, H01L 1700, G01J 100

Patent

active

042272106

ABSTRACT:
A rotatable thermal shutter for use with a pyroelectric camera tube is provided with blades having opening and closing edges in the shape of a spiral. The use of a spiral shape allows the rotatable shutter to have a particularly small diameter while still providing satisfactory performance.

REFERENCES:
patent: 2339256 (1944-01-01), Doncaster
patent: 2403066 (1946-07-01), Evans
patent: 3003064 (1961-10-01), Astheimer
patent: 3256438 (1966-06-01), Astheimer
patent: 3638025 (1972-01-01), Dishington et al.
patent: 4040744 (1977-08-01), Schertz et al.

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